Procedural memories for well-learned skills such as how to ride a bicycle are typically

The given blank can be filled with implicit memory.

The implicit memory is a type of long term memory. This type of the memory is used and acquired unconsciously. This can affect the thought and the behavior of the person.  

In the given case, once a person learns to ride a bicycle, whenever he or she will ride a bicycle will start paddling and balancing the handle and tires, even if it is unknown to the person that he is doing all these things.

one characteristic that is shared by all is a soft body. many

of these invertebrate animals also have an outer shell to protect their

body. oysters, clams, snails, and mussels are all mollusks. so are octopuses, squids, and slugs. mollusks live on land and in freshwater.

a and c are the answeres